Bump FFmpeg version to 4.4 to fix a problem where it would write the
wrong frame rate. Their old API was deprecated and Blender moved to the
new one in rB8d6264ea12bfac0912c7249f00af2ac8e3409ed1. The new one
produced files with the wrong frame rate, which was fixed in FFmpeg 4.4.
Manifest Task: T88568
Reviewed By: LazyDodo, zeddb
Differential Revision: https://developer.blender.org/D11392